My Camaro caught fire in 1999 (a professional stereo installer did it) and I could never love another car. I took my insurance money and bought a Virago 250. Commuted on it, traded up and up and up... TL1000s, SV650, a number of ratbikes, and the Duc. Didn't have a car for six-seven years.
A couple of times my girlfriend would leave me her car if I had to carry a lot of sh*t to work, and my uncle gave me a free truck once, but I left it in LA.
I had/have good rain gear (tip: the Brits know their rain gear), and I enjoyed grocery shopping on the bike (tip: tortillas don't smush like bread and it's smaller). I also had a skateboard and a bus pass for the last couple of years.
A few years ago I had my skull broken in an assault and I wasn't allowed to wear a helmet for a few months, so I bought an old SuperBeetle, but I'm all better and it's parked in my folks' garage, non-op.
It's not too hard to go bike only. Takes some balls on certain days. But if I could do it on a Ducati and a TL, not the most practical bikes, then you should be able to. Helps to have a ratbike if you're going to park in a bad neighborhood.